/**
 * Created with IntelliJ IDEA
 * Description:
 * User: Administrator
 * Data: 2023 - 04 - 16
 * Time: 12:20
 */
//计算1/1-1/2+1/3-1/4+1/5 …… + 1/99 - 1/100 的值
public class test1 {
    public static void main(String[] args) {
        int flag = 1;
        double sum = 0.0;
        for (int i = 1; i <= 100 ; i++) {
            sum += flag * (1.0 / i);
            flag = -flag;
        }
        System.out.println(sum);
    }
}
